Lock.



0. K. TILLIVIAN.

LOCK.v APPUCATION FILED AUG-9, 19H- Patented Apr. 30,1918.

GU 0: way, 3

pnrrnn srarr onion 1;. Tr maran, or HQRNER, wEs'rv VIRGINIA.

LOCK.

mean

i ris ne a pl ca i fi ed I 1 8. rial N 3. D riee and h s Serial No.

To all whom, it may concern Be it known that I, On on K. TILL- iyn n, a citizen oi. the United States, residingat liorner, in the county of Lewis and State of v i/ est Virginia, have invented certain new and nseiul Improvements in Locks, of which the following is a specification:

'lflhis invention relates to looks, the present application being a division of an application filed by me June 8, 1917, Serial No. 173,589.

In the accompanying drawings:

Figure l is an elevation of the lock, with the side of the casing removed,

is- 2 s a er i al ect as the i 22 of Fig. 1,

Fi 3 s a detail p rspe ive vi of the bolt and the tumblers cotiperating therewith, this figure showin the side of the bolt opposite that appearing in Fig. 1.

The numeral 1 indicates a portion of a door having a mortise 2 therein which is covered by a mortise plate 3. The lock casing 1 is fitted within the mortise and in the upper portion of the casing is a latch 11 constructed with a tongue 12 to project through the casing and engage the lock strike. The latch is constructed with an elongated opening 1 1 in order to slide past the hub 6 and the knob spindle 5, said hub having a tooth 9 to engage a notch 10 in the wall of the said opening. A spring 17 bears upon the latch and tends to hold it projected and below the latch is a gravity dog 20 mounted upon a stud pivot 21 and having a tooth 22 to engage a notch in the lower edge of the latch to aid in holding it projected.

A partition 49 is provided within the lock case 4 below the gravity dog 20 and is shaped, as shown clearly in Fig. 1, to receive the lower forward corner of said dog when the same is in its lowest position. Below the said partition, the key bolt 50 is slidably mounted in the lock case and rests upon the lower wall of said case, said wall being inclined rearwardly, as shown at 51, so that the bolt will tend to remain in a retracted position under the influence of gravity. A dust escape opening 52 is provided through the lower wall or end of the lock case so as to permit the escape of any dirt or dust that may accumulate therein. The bolt is constructed near its rear end with a transverse shoulder 53 adapted to Specification of Letters Patent.

meme mre W application filed August 9, 1917.

nga e a Projecti .1 the 11 .1 Well of the lock case and be thereby limited in its retracting movement, and a transverse shoulder is provided on the under side or edge of the bolt to engage a shoulder 56 on the lower wall 01 the lock case and therey mi h pr j c ing awvem nt oi he bolt. The projecting movement" of the bolt is further limited by the transverse shoulder 57 a t e op f. h b lt n ar the en e thereof, and a web 58 extends longitudinally Qi' the' ol fr the ront n hereo t9 the ear end, he. i Web ng of 93 width than the bolt so that a space is pro vided at each side of the web in which the W rds of a key may pl y- A tran ver opening 59 is formed through the bolt and the said web 58 and the upper wall of this opening is defined by a substantially in vented V-shaped notch 60 formed in the lower edge of the web. On one side of the bolt, I form a step 61 which is adapted to be engaged by the reduced front end 62 ot a tumbler 63 which is pivoted at its inner or rear end upon the side of the partition 49, and a spring 6% may be secured upon the partition so as to bear upon the upper edge of said tumbler and insure its engagement with the bolt at all times. When the bolt is retracted, as shown in Fig. 1. the reduced end of the tumbler fits over the step 61 and rests upon the upper or tread surface of the step. When, however, the bolt is pro jected, the extremity of the tumbler drops into engagement with the riser portion of the step and thereby serves to prevent retraction of the bolt. On the opposite side of the bolt, a ledge 65 is provided at the side of the web 58 and a tooth or spur 66 is located on this ledge between the ends of the same. A tumbler 67 is pivoted at its inner rear end on the side of the partition 49 and the free end of this tumbler is constructed with a notch 68 and a hook or bill 69. When the bolt is retracted, the tooth or spur 66 will be engaged in the notch 68 and will, consequently, be held against movement in either direction. YV hen a proper key, however, has been inserted and manipulated, .the bolt will be projected and the hook or bill 69 will drop behind the lug, tooth or spur 66 and will, consequently, aid the tumbler 63 in hold" ing the bolt projected so that the door will be held locked. The key to release the look will, of course, be fitted to the dimensions of the tumblers and the wall of the notch 60 in the bolt, and slight variations in the proportions of these parts will render any particular lock inoperative to any key. except the one fitted especially to it. The key will be constructed with a notched wing so that when it is inserted through the key hole 70 and turned the notched edge of the wing will ride upon the rear wall of the notch 60 and will engage the front Wall of the same so as to exert a push upon the bolt through the web 58. T he edges of the wing at the sidesof the notch will bear against the under edges of the respective tumblers and will release the same so that the bolt may be projected, and continued movement of the key will, of course, release the tumblers so that they will drop into engagement with the bolt to hold it in the locked position. Rotation of the key in the opposite direction Will first release the tumblers from the bolt and Will then ride against the wall of the notch in the web so as to retract the bolt, as will be readily understood.

Having thus described the invention, what is claimed as new is:

1. In a lock, the combination of a slidably mounted gravitating bolt having a central longitudinal web provided with a substantially V-shaped notch in its lower edge, a step on one side of the bolt, and a tumbler pivotally mounted above the bolt and having a reduced end adapted to rest on said step in one position of the bolt and engage against the step in another position of the bolt.

2. In a lock, the combination of a slidably mounted gravity bolt, a tooth on one side of the bolt, and a tumbler pivotally mounted above the bolt and constructed at its end to engage own or against the inner side of said tooth.

3. In a lock, the combination oi a lock easing having an inclined lower wall and provided with spaced vertical shoulders on said wall, and a bolt slid-ably mounted on said wall and provided on its lower edge with stops adapted to engage said shoulders whereby the retracting and projecting movement of the bolt will be limited.

In testimony whereof I aflix my signature.

ORION K. TILLMAN. L 5.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents, Washington, D. G. 

